How do you get a good grade in a Calculus class? My teacher takes off points for everything, even problems you get right could turn into a -5. You could write out every step and she'd find something to mark off :|
I remember taking calculus and you have to write out every step. But my professor took off points for messing up in the steps even if you get the answer right. Or takes points off for the answer but not the whole question.
Your teacher seems like a dick if she finds stuff to mark off. I would just look at what she marks off and learn from it or talk to her about why she marked it off.